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Vaginal temperature rhythms in sheep
International Journal of Chronobiology
|January 1, 1977
Summary
Ovariectomized sheep exhibit a predominant circadian rhythm in vaginal temperature, with daily temperature fluctuations as small as 0.05 degrees Celsius. This study reveals ultradian rhythms in some animals, indicating complex thermoregulation patterns.
Area of Science:
- Animal physiology
- Chronobiology
- Thermoregulation
Background:
- Ovariectomy in adult sheep can alter physiological rhythms.
- Understanding thermoregulation is crucial for animal welfare and research.
Purpose of the Study:
- To investigate the presence and characteristics of circadian and ultradian rhythms in vaginal temperature of ovariectomized sheep.
- To quantify the amplitude and timing of identified temperature rhythms.
Main Methods:
- Six ovariectomized adult sheep were monitored in a controlled environment.
- Vaginal temperatures were recorded continuously over 12-17 days.
- Time-series analyses, including periodogram, correlogram, and spectral density, were applied to identify rhythms.
Main Results:
- A predominant circadian rhythm in vaginal temperature was detected in 5 out of 6 sheep.
- Ultradian rhythms (12-hour and 8-hour periods) were observed in some animals.
- The amplitude of the circadian rhythm ranged from 0.05 to 0.16 degrees C, with daily temperature peaks occurring between 08:51 and 17:27.
Conclusions:
- Ovariectomized sheep display significant circadian rhythms in vaginal temperature.
- The study highlights the presence of both circadian and ultradian thermoregulatory patterns in this animal model.
- These findings contribute to understanding the influence of reproductive status on physiological rhythms.